Accumulated Other Comprehensive Income (Summary Of Accumulated Other Comprehensive Income) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		$ 6,115,000
Total change in hedge fair value recorded in Other Comprehensive Income		(183,000)
Amounts reclassified from accumulated other comprehensive income		68,000
Net change related to derivatives		(115,000)	$ (137,000)
Net current-period other comprehensive income		(526,000)
Balance		5,589,000	6,115,000
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	[1]	8,687,000
Total change in hedge fair value recorded in Other Comprehensive Income	[1]
Amounts reclassified from accumulated other comprehensive income	[1]
Net change related to derivatives	[1]
Net current-period other comprehensive income	[1]	(569,000)
Balance	[1]	8,118,000	8,687,000
Net of income tax benefit (expense)		5,000
Unrealized Gain (Losses) On Available-For-Sale Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		3,000
Total change in hedge fair value recorded in Other Comprehensive Income
Amounts reclassified from accumulated other comprehensive income
Net change related to derivatives
Net current-period other comprehensive income		7,000
Balance		10,000	3,000
Accrued Pension Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	[2]	(2,438,000)
Total change in hedge fair value recorded in Other Comprehensive Income	[2]
Amounts reclassified from accumulated other comprehensive income	[2]
Net change related to derivatives	[2]
Net current-period other comprehensive income	[2]	151,000
Balance	[2]	(2,287,000)	(2,438,000)
Net of income tax benefit (expense)		(56,000)
Hedge Accounting Reserve [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	[3]	(137,000)
Total change in hedge fair value recorded in Other Comprehensive Income	[3]	(183,000)
Amounts reclassified from accumulated other comprehensive income	[3]	68,000
Net change related to derivatives	[3]	(115,000)
Net current-period other comprehensive income	[3]	(115,000)
Balance	[3]	(252,000)	$ (137,000)
Net of income tax benefit (expense)		$ 42,000

[1] Net of income tax benefit of $5,000.

[2] Net of income tax expense of $56,000.

[3] Net of income tax benefit of $42,000